v3.25.2
Fair Value Measurements, Fair Value Of Financial Instruments as Measured On a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Assets: [Abstract]            
Trading securities $ 5,559,417   $ 4,899,090      
Available-for-sale securities 13,347,821   12,851,600      
Fair value option securities 107,702   17,876      
Mortgage servicing rights 334,644 $ 342,111 338,145 $ 333,246 $ 319,330 $ 293,884
Derviative contracts, net of cash collateral, Assets, Fair value 362,908   242,809      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 285,417   237,582      
U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 997   21,275      
Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 5,450,517   4,792,695      
Available-for-sale securities 9,102,658   8,639,389      
Fair value option securities 107,702   17,876      
Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 64,653   62,230      
Available-for-sale securities 208,350   225,568      
U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 964   945      
Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 743,519   781,209      
Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,291,857   3,204,016      
Other debt securities [Member]            
Assets: [Abstract]            
Trading securities 43,250   22,890      
Available-for-sale securities 473   473      
Fair Value, Recurring [Member]            
Assets: [Abstract]            
Trading securities 5,559,417   4,899,090      
Available-for-sale securities 13,347,821   12,851,600      
Residential mortgage loans held for sale 101,437 [1]   77,561 [2]      
Mortgage servicing rights 334,644 [3]   338,145 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 362,908 [5]   242,809 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 285,417 [5]   237,582 [6]      
Fair Value, Recurring [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 997   21,275      
Fair Value, Recurring [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 5,450,517   4,792,695      
Available-for-sale securities 9,102,658   8,639,389      
Fair value option securities 107,702   17,876      
Fair Value, Recurring [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 64,653   62,230      
Available-for-sale securities 208,350   225,568      
Fair Value, Recurring [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 43,250   22,890      
Fair Value, Recurring [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 964   945      
Fair Value, Recurring [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 743,519   781,209      
Fair Value, Recurring [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,291,857   3,204,016      
Fair Value, Recurring [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 473   473      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets: [Abstract]            
Trading securities 0   1,494      
Available-for-sale securities 964   945      
Residential mortgage loans held for sale 0 [1]   0 [2]      
Mortgage servicing rights 0 [3]   0 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 7,058 [5]   656 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 2,790 [5]   3,391 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 0   1,494      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 964   945      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]            
Assets: [Abstract]            
Trading securities 5,559,417   4,897,596      
Available-for-sale securities 13,346,384   12,850,182      
Residential mortgage loans held for sale 94,823 [1]   70,564 [2]      
Mortgage servicing rights 0 [3]   0 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value 355,850 [5]   242,153 [6]      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value 282,627 [5]   234,191 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 997   19,781      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 5,450,517   4,792,695      
Available-for-sale securities 9,102,658   8,639,389      
Fair value option securities 107,702   17,876      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 64,653   62,230      
Available-for-sale securities 208,350   225,568      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 43,250   22,890      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 743,519   781,209      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 3,291,857   3,204,016      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 473   473      
Residential mortgage loans held for sale 6,614 [1]   6,997 [2]      
Mortgage servicing rights 334,644 [3]   338,145 [4]      
Derviative contracts, net of cash collateral, Assets, Fair value $ 0 [5]   $ 0 [6]      
Liquidity Discount on Mortgage Loans Qualifying for Sale to US Govt Agencies 81.03%   81.11%      
Liabilities: [Abstract]            
Derivative contracts, net of cash collateral, Liabilities, Fair Value $ 0 [5]   $ 0 [6]      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. government securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 0   0      
Fair value option securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal securities [Member]            
Assets: [Abstract]            
Trading securities 0   0      
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other trading securities            
Assets: [Abstract]            
Trading securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Treasury [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential non-agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial agency mortgage-backed securities [Member]            
Assets: [Abstract]            
Available-for-sale securities 0   0      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other debt securities [Member]            
Assets: [Abstract]            
Available-for-sale securities $ 473   $ 473      
[1] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 81.03% of the unpaid principal balance.
[2] Residential mortgage loans held for sale measured at fair value on a recurring basis using significant unobservable inputs (Level 3) consist of residential mortgage loans intended for sale to U.S. government agencies that fail to meet conforming standards and are valued at 81.11% of the unpaid principal balance.
[3] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 5, Mortgage Banking Activities.
[4] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 5, Mortgage Banking Activities.
[5] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading and internal risk management purposes.
[6] See Note 3 for detail of fair value of derivative contracts by contract type. Derivative contracts in asset and liability positions that were valued based on quoted prices in active markets for identical instruments (Level 1) are primarily exchange-traded interest rate derivative contracts held for trading and internal risk management purposes.